Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

v3.22.1
Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Nov. 30, 2021
Sep. 30, 2021
Feb. 28, 2021
Sep. 30, 2020
Mar. 31, 2018
Commitments and Contingencies (Details) [Line Items]              
Possible severance payments $ 10,000 $ 10,000          
Export Import Bank of China [Member]              
Commitments and Contingencies (Details) [Line Items]              
Carrying amount       $ 3,237,000   $ 19,900,000  
Long-term loans       $ 3,240,000   $ 76,600,000  
Global Deep Ocean [Member] | Export Import Bank of China [Member]              
Commitments and Contingencies (Details) [Line Items]              
Carrying amount             $ 392,000
Long-term loans             $ 13,800,000
Hong Long [Member] | Export Import Bank of China [Member]              
Commitments and Contingencies (Details) [Line Items]              
Carrying amount         $ 26,700,000    
Long-term loans         24,500,000    
Hong Long [Member] | Industrial and Commercial Bank of China [Member]              
Commitments and Contingencies (Details) [Line Items]              
Carrying amount         39,500,000    
Long-term loans         $ 25,400,000    
Hong Long [Member] | Fujian Haixia Bank [Member]              
Commitments and Contingencies (Details) [Line Items]              
Carrying amount     $ 6,300,000        
Long-term loans     $ 26,700,000